/* 初始化 */
*{
    margin: 0;
    padding: 0;
  }
  /* header部分的样式 */
  .header{
    background-color: black;
    color: white;
    height: 80px;
  }
  .content{
    width: 90%;
    margin: 0 auto;
    overflow: hidden;/* 清除浮动 */  
  }
  .header-left{
    width: 30%;
    float: left;
  }
  .header-left img{
    height: 50px;
    margin-top: 15px;
    float: left;
  }
  .header-left span{
    line-height: 80px;
    display: block;
    float: left;
    color: #bcaa91;
  }
  .header-mid{
    width: 40%;
    float: left;
  }
  .header-mid ul{
    list-style: none;/* 清除列表的样式*/
    overflow: hidden;/* 清除浮动(子元素li的浮动)*/  
  }
  .header-mid ul li{
    float: left;
    width: 25%;
    /* height: 80px; */
    text-align: center;
  }
  /* class为active的li元素 */
  .header-mid ul li.active a{
    color: red;
  }
  .header-mid a{
    color: white;
    text-decoration: none;
    line-height: 80px;
  }
  .header-right{
    width: 30%;
    float: left;
  }
  .header-right img{
    height: 40px;
    margin-top: 20px;
    float: right;
  }
  .header-right span{
    line-height: 80px;
    display: block;
    float: right;
    margin:0 20px;
  }
  .header-right button{
    width: 100px;
    height: 40px;
    margin-top: 20px;
    border-radius: 10px;/*边框为圆形，半径*/
    background-color: transparent;
    color: white;
    cursor: pointer;/*改变鼠标的光标形状*/
    float: right;
  }
  .header-right button:hover{
    background-color: #c85353;
    color: black;  
  }

  /* bannner部分的样式 */
.banner{
  background-color: #5f5b5b;
  color: white;
}
.banner-left{
  width: 40%;
  float: left;
}
.banner-left h1{
  margin: 100px 0 30px;
  font-weight: 300;/*字体的粗细，100-900*/
}
.banner-left p{
  color:#c3c0c0;
  font-size: 14px;
  line-height: 30px;
}
.banner-left span{
  margin-top: 30px;
  display: block;
  width: 200px;
  height: 50px;
  line-height: 50px;
  background-color: #f73f3f;
  text-align: center;
  font-size: 20px;
  border-radius: 25px;
  cursor: pointer;/*改变鼠标的光标形状*/
}
.banner-left span:hover{
  background-color: transparent;
  color: #f73f3f;
  border: solid 1px #f73f3f;
}
.banner-right{
  width: 40%;
  float: right;
  text-align: right;  
}
.banner-right img{
  width: 80%;
  max-width: 450px;
}